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Miley Cyrus and male friend in L.A. on March 7 (Blanco-RS-Maciel/X17online.com)

Miley Cyrus isn't letting breakup rumors get her down.

The "Can't Be Tamed" singer was photographed en route to a party in L.A. on Thursday without her engagement ring for the second night in a row. X17 Online has photos of the star heading to a friend's birthday in North Hollywood where she hung for a few hours with a "mystery man."

So, is fiancé Liam Hemsworth out, and this guy in?

Nope.

omg! spoke to sources close to Cyrus who assure us that this man in question (Paul Khoury) is "a good friend of Miley's," adding that they have "known each other for years."

Although Cyrus, 20, vehemently denied this week that her wedding was off, the singer has been not been photographed wearing her engagement ring since March 1.

"Liam and Miley are going through a rough patch," continues omg!'s source. Hemsworth, 23, is back in Australia right now with his family and it sounds like the couple is taking time apart (literally) to figure out what they want.

Star magazine claimed that Hemsworth, 23, cheated on Cyrus with January Jones over Oscar weekend and the "Mad Men" actress has kept mum on the report. Jones, 35, was photographed arriving back in Los Angeles on Thursday and was quiet when paps asked if there was any truth to the rumors.

Meanwhile, Us Weekly also reported that the "Catching Fire" star got flirty with actress Emma Watson at a different party over Oscar weekend.

Chime in: Do you hope Cyrus and Hemsworth work things out? Tell us in our poll below!